add: leetcode 0506 solution

leetcode/0506.Relative-Ranks/506.Relative Ranks.go

@@ -0,0 +1,29 @@
+package leetcode
+
+import (
+	"sort"
+	"strconv"
+)
+
+func findRelativeRanks(score []int) []string {
+	mp := make(map[int]int)
+	for i, v := range score {
+		mp[v] = i
+	}
+	sort.Slice(score, func(i, j int) bool {
+		return score[i] > score[j]
+	})
+	ans := make([]string, len(score))
+	for i, v := range score {
+		if i == 0 {
+			ans[mp[v]] = "Gold Medal"
+		} else if i == 1 {
+			ans[mp[v]] = "Silver Medal"
+		} else if i == 2 {
+			ans[mp[v]] = "Bronze Medal"
+		} else {
+			ans[mp[v]] = strconv.Itoa(i + 1)
+		}
+	}
+	return ans
+}